Val is correct, in fact I don't personally consider the NAT rulebase a "real" policy layer like all the others. You are confined to using host/network/range IP addresses along with port numbers (and groups of these) in NAT rules, and can't use most of the more advanced object types introduced later such as Access Roles, Security Zones, and Applications/URL Categories. Updatable Objects can be used in NAT rules, but only if they just consist of a list of IP addresses/networks.
Attend my online "Be your Own TAC: Part Deux" CheckMates event
March 27th with sessions for both the EMEA and Americas time zones